Google Goggles is a visual search app for Android phones and the demo shows it running on the Sony Ericsson X10. Have not been able to find what engine is used for the visual recognition but based on news searches, seems like it could be powered by Neven Vision. which they acquired in 2006.
What is interesting is they actually have a patent for an “image-based search engine for mobile phones with camera”. I’m not sure if this means that other players in the market will not be able to launch similar services.